Changes in EPA and DHA during supplementation with omega-3 fatty acids and incident cardiovascular events: secondary analysis from the OMEMI trial

Background

In the OMEMI trial, elderly post-MI patients did not achieve reduction in cardiovascular events from supplementation of 1.8g n-3 polyunsaturated fatty acids (PUFA). In two recent trials of hypertriglyceridaemic patients the REDUCE-IT trial demonstrated an association between high levels of serum eicosapentaenoic acid (EPA) and reduced risk of CV events with 4 g/day icosapent ethyl supplements while in the STRENGTH trial no such association was present in patients treated with 4 g/day of EPA+ docosahexaenoic acid (DHA).

Purpose

To assess associations between changes in concentrations of EPA and DHA during two years supplementation with n-3 PUFA and incident cardiovascular events in the OMEMI trial.

Methods

In the randomized controlled OMEMI trial, 1014 elderly patients with a recent acute myocardial infarction (AMI) were treated with 1.8g/day of EPA and docosahexaenoic acid (DHA) or placebo for two years, and followed for the primary outcome of MACE (AMI, coronary revascularization, stroke or heart failure hospitalization) and secondary outcome of new-onset atrial fibrillation (AF). Serum concentrations of EPA and DHA were measured at inclusion and at study completion by gas chromatography, and reported as % weight of total FA (%wt) in serum phospholipids.

Results

Serial EPA and DHA measurements at study inclusion and completion were available in 881 patients (92% of survivors). At baseline EPA and DHA concentrations were (mean±SD) 2.84±1.41 and 5.71±1.35%wt, respectively. Higher baseline EPA and DHA concentrations were associated with previous n-3 PUFA supplementation, lower prevalence of current smoking and diabetes, lower levels of triglycerides and higher levels of HDL-cholesterol (all p<0.05). In patients randomized to n-3 PUFA, EPA and DHA increased with 2.32±1.92 and 0.91±1.19%wt, respectively, whereas in the placebo group EPA and DHA decreased with −0.39±1.37 and −0.43±1.13%wt, respectively. Greater increases in EPA and DHA during follow-up were associated with a lowering of triglyceride concentrations, increasing HDL concentrations, and lower baseline concentrations of EPA and DHA (all p<0.001). Among patients treated with n-3 PUFA (n=438), a greater increase in EPA was associated with a lower risk of incident MACE (HR 0.89 [95% CI 0.78–1.00] per %wt, p=0.059) and higher risk of new-onset AF in patients free of AF at inclusion (n=339): HR 1.31 [1.06–1.62] per %wt, p=0.012 (Figure). There were no such associations for changes in DHA: HR 0.86 (95% CI 0.70–1.05), p=0.13 for MACE and HR 1.29 (0.91–1.83), p=0.16 for new-onset AF.

Conclusion

Patients treated with 1.8 g/day n-3 PUFA for two years experienced a doubling of serum EPA concentrations. Greater increases in EPA were associated with a lower risk of MACE, but also a higher risk of new-onset AF. Changes in DHA concentrations were not associated with outcomes, suggesting that EPA may be the more important n-3 PUFA with respect to risk of cardiovascular events.

Funding Acknowledgement

Type of funding sources: Public hospital(s). Main funding source(s): Oslo University Hospital, Ullevål Figure 1

Beta Decay of Molecular Tritium

The beta decay of tritium in the form of molecular T_{2} is the basis of sensitive experiments to measure neutrino mass. The final-state electronic, vibrational, and rotational excitations modify the beta spectrum significantly and are obtained from theory. We report measurements of the branching ratios to specific ionization states for the isotopolog HT. Two earlier, concordant measurements gave branching ratios of HT to the bound HHe^{+} ion of 89.5% and 93.2%, in sharp disagreement with the theoretical prediction of 55%-57%, raising concerns about the theory's reliability in neutrino mass experiments. Our result, 56.5(6)%, is compatible with the theoretical expectation and disagrees strongly with the previous measurements.

Abdominal actinomycosis after laparoscopic cholecystectomy: a rare complication of bile spillage

BACKGROUND

Abdominal actinomycosis has not been reported after elective cholecystectomy.

METHODS

Case report and review of the pertinent English-language literature.

CASE REPORT

A 69-year-old man with abdominal actinomycosis presented with an abdominal mass mimicking a malignant tumor two years after laparoscopic cholecystectomy. Investigation revealed the likely source of infection to be bile spillage during surgery.

CONCLUSION

This is the first reported case of abdominal actinomycosis probably attributable to bile spillage during laparoscopic cholecystectomy.

Basal cell carcinoma does metastasize

Basal cell carcinoma (BCC) rarely metastasizes. However, this unfortunate outcome can occur, usually in neglected tumors. We report a 52-year-old man with a BCC on the left chest that enlarged and then ulcerated over a 6-year period. Metastasis of the tumor to lymph nodes in the left axilla resulted, but the patient remains free of disease 24 months after wide excision, lymph node dissection, and local radiation therapy to the axilla.

Comparative evaluation of the efficacy and safety of two doses of terbinafine (500 and 1000 mg day-1) in the treatment of cutaneous or lymphocutaneous sporotrichosis. Vergleichende Bewertung der Wirksamkeit und Sicherheit zweier Terbinafin-Dosierungen (500 und 1000 mg/Tag) in der Therapie der kutanen und lymphokutanen Sporotrichose

The aim of this study was to evaluate the safety and efficacy of oral terbinafine (500 and 1000 mg day(-1)) in the treatment of cutaneous or lymphocutaneous sporotrichosis. A culture for Sporothrix schenckii was required for inclusion into this multicentre, randomized, double-blind, parallel-group study. Patients received either 250 mg b.i.d. or 500 mg b.i.d. oral terbinafine for up to a maximum of 24 weeks and were assessed up to 24 weeks post-treatment. The main efficacy outcome measure was cure, defined as no lesion and absence of adenopathy at the end of follow-up. Adverse events (AEs), laboratory tests, vital signs and ophthalmological examinations were also assessed. Sixty-three patients (14-85 years of age) were treated with 500 mg day(-1) (n = 28) or 1000 mg day(-1) terbinafine (n = 35). The majority of patients were cured after 12-24 weeks of treatment, and the response was dose-dependent throughout the study and at the end of follow-up. The cure rate was significantly higher in patients treated with 1000 mg day(-1) terbinafine compared with those treated with 500 mg day(-1) terbinafine (87% vs. 52%, respectively; P = 0.004). There were no cases of relapse after 24 weeks of follow-up in the 1000 mg day(-1) terbinafine group, compared with six relapses in the terbinafine 500 mg day(-1) group. Terbinafine was well tolerated and the frequency of drug-related AEs was slightly higher in the 1000 mg treatment group. Both doses of terbinafine were well-tolerated and effective for the treatment of sporotrichosis. The 1000 mg day(-1) terbinafine dose was more efficacious than 500 mg day(-1) in the treatment of cutaneous or lymphocutaneous sporotrichosis.

Clinical trial: the safety of terbinafine in patients over the age of 60 years: a multicenter trial in onychomycosis of the feet

Thirty patients completed this open-label, multicenter prospective study performed to evaluate the efficacy and safety of terbinafine treatment of onychomycosis of the feet in elderly patients. Inclusion criteria included an age of 60 years or older, a diagnosis of onychomycosis confirmed by positive potassium hydroxide (KOH) preparation at baseline, and toenails capable of regrowth. Patients were excluded from the study if they had received any systemic antifungal therapy within the previous 3 months or topical antifungal therapy within 1 week prior to the start of the study; had psoriasis; had toenail abnormalities interfering with normal toenail appearance; were immunosuppressed or immunodeficient; or had serum hepatic enzyme (serum glutamic-oxaloacetic transaminase, SGOT; serum glutamic-pyruvic transaminase, SGPT) values greater than 1.5 times the upper limit of normal at baseline. Following baseline evaluations, eligible patients received a 12-week supply of oral terbinafine (250 mg/day) for self-administration. Compliance was assessed by tablet counts at each visit and defined as the use of at least 80% of the medication prescribed at the first two visits. Follow-up evaluations were conducted for the next 60 weeks, for a total study period of 72 weeks. These visits occurred at weeks 6, 12, 24, 36, 48, and 72. All follow-up visits included: (i) the reporting of adverse effects; (ii) assessment of efficacy by KOH preparation, mycologic culture, and investigator evaluation; and (iii) physician and patient global assessments of various quality of life parameters (except for the visit at week 36). Safety and tolerance were assessed by physical examination at baseline and week 12, by laboratory evaluations (hematology, blood chemistry, and urinalysis) at baseline, week 6 and week 12, and by reporting and evaluation of adverse events throughout the entire study. Investigators assessed the extent of involvement of the target toenail and recorded global assessments of therapeutic efficacy at all visits. Mycologic evaluation was conducted by KOH preparation and a mycologic culture of the target toenail. Because of discrepancies in KOH results between the investigator sites and the central laboratory in early analyses, we chose to use the mycologic culture results to evaluate efficacy. Because all 30 subjects were treated with terbinafine, the entire group was considered for safety evaluation.

Smooth muscle cell outgrowth stimulated by fibrin degradation products. The potential role of fibrin fragment E in restenosis and atherogenesis

This study is based on the observation that deposition of thrombus within the arterial wall and on its surface is a consistent response to the vascular injury of angioplasty and of angioplasty lesions at risk of rapid restenosis. Mitogenic activity is stimulated by fibrin degradation products in extracts of human atherosclerotic plaques and plasmin digests of fibrin, and this has been attributed to products that include fibrin fragment E. The effect of human fibrin degradation products on smooth muscle outgrowth from rabbit aortic medial explants now has been explored in culture. Every batch of fibrin degradation products was first tested on the in vivo chick chorioallantoic membrane model for the ability to stimulate cell proliferation, including angiogenesis as shown previously. Increasing concentrations of fibrin degradation products were stimulated significantly earlier and with greater outgrowth of smooth muscle cells than controls, up to an optimum at 92 microg/mL fibrin degradation products. The effect of fibrin degradation products was blocked by the prior admixture of a specific antifragment E antiserum, but not by an antifragment D antiserum. Purified commercial fibrinogen E is inactive, but when treated with thrombin to resemble fibrin E it stimulated smooth muscle cell outgrowth, and this was not seen with comparable dosages of fragment D. We propose that fibrin degradation products, in particular fibrin fragment E, provide an abundant in situ early initiator of smooth muscle cell migration and proliferation in restenosis and atherogenesis.

Fibrin gel induces the migration of smooth muscle cells from rabbit aortic explants

A major step in the pathogenesis of atherosclerosis is the vectorial migration of smooth muscle cells (SMCs) from the arterial media into the intima. Although subcultured SMCs usually show synthetic phenotype, the behaviour of contractile SMCs may be crucial for the subsequent migration of the cells. In the present study, we utilized an in vitro assay system to evaluate the effects of fibrin gels on the migration of SMCs from explants taken from rabbit aorta. After cultured for 5-7 days in a serum-free condition, SMCs appeared from explants covered with fibrin gel. The cells were positive on immunostaining for SMC specific alpha-actin. No migration of SMCs from the control explants without fibrin gel was observed. Then the percentage of explants showing cell migration and the number of migrating cells increased with time. The migration of SMCs into fibrin gels was not dependent on the concentration of fibrinogen used for the preparation of fibrin gel in the range of 1.5-3 mg/ml. Variations of thrombin concentration in the range of 0.25-1.25 U/ml had no significant effect. However, there was less migration of SMCs with higher concentrations of thrombin. Thrombin inhibitors, hirudin and PPACK had no significant effect on the migration of SMCs. An RGD-containing peptide, GRGDS inhibited the migration of SMCs although a control peptide GRGES at the same concentration had no significant effect. A monoclonal antibody to alphavbeta3, LM609, completely inhibited the migration of SMCs from the explants, suggesting that alphavbeta3 integrin is involved in the migration of SMCs into fibrin gels. SMCs which migrated from the explants showed the positive staining with the monoclonal antibodies against SMC myosin heavy chain isoforms, SMemb, SM1 and SM2, suggesting that they are in an intermediate state changing from contractile to synthetic state. In conclusion, the present study showed that fibrin gel induces the migration of SMCs from explants into itself and the process may not need other growth factors or cytokines.

Comparison of adapalene 0.1% solution and tretinoin 0.025% gel in the topical treatment of acne vulgaris

A multicentre study was conducted to compare clinical safety and efficacy of adapalene 0.1% solution and tretinoin 0.025% gel, both topical treatments for acne, in a once-daily dosage regimen for 12 weeks. A total of 297 patients were enrolled by eight investigators in this randomized, investigator-masked study in a parallel group design. An open label period using adapalene followed this study to assess the long-term safety of adapalene solution. Adapalene and tretinoin proved to be clinically and statistically effective in treating acne by reducing inflammatory (47% and 50%, respectively) and non-inflammatory lesions (57% and 54%) as compared to baseline. When comparing patients who had 75% or greater improvement in open comedones, adapalene was shown to be significantly more effective than tretinoin. No serious adverse event was reported during this study, including during the long-term period. The reactions that occurred were similar between treatments, i.e. burning, pruritus, scaling, dryness and erythema.

Pattern of breast cancer among white-American, African-American, and nonimmigrant west-African women

This study reviews the current understanding of the pattern of breast cancer among whites, African Americans, and West Africans who have never immigrated to the US to find better ways of improving the prevention, early detection, and care of breast cancer world-wide. In the United States, the behavior pattern of breast cancer in African-American women differs from that of white women. Among the three populations, breast cancer appears to be least common in nonimmigrant West-African women. The peak incidence in African Americans and West Africans occurs around the premenopausal period while it occurs postmenopausal period in whites. Also, unlike white women, West-African and African-American women present late for treatment with a greater cancer burden and consequently lower survival rates. The predominant histological type is infiltrating ductal carcinoma in the three groups but the highest percentage (33%) of infiltrating poorly differentiated anaplastic carcinoma occurs in West Africans. Menstrual and obstetric history, obesity, and high body mass index status appear to be greater specific risk factors among African Americans than among West Africans. African Americans and West Africans have three "Ls" in common: late stage in seeking treatment, lower age at peak incidence with severe tumor burden, and consequently lower survival rates. There is a need for more detailed population-based research at molecular levels to elucidate the basis for some of these features.

Patient consultation in a managed care setting: guiding pharmacy into the future

Managed care organizations are excellent environments for pharmaceutical care programs to demonstrate their impact on patient care outcomes and to decrease costs. Patient consultation is the cornerstone in implementing pharmaceutical care because it increases patient contact with the pharmacists while improving patient compliance with drug therapy (adherence). Implementation of a patient consultation program that verifies patients' understanding of their disease and therapy gives the pharmacist information necessary to monitor drug therapy. Use of strategic planning to overcome barriers, followed by the development of local standards of practice, will refocus the practice philosophy to one of improving patient outcomes. Pharmacy managers must demonstrate and document the value that patient consultation brings to the patient and the healthcare system. Then, they must integrate their counseling effort with other health education efforts of the managed care system. Pharmacists will gain the support of other disciplines by reinforcing their efforts. Together they can work to decrease the problems that are inherent with drug therapy. These goals can be accomplished with minimal expense and have the potential to produce significant savings in healthcare costs.

Pharmacokinetics of three doses of once-weekly fluconazole (150, 300, and 450 mg) in distal subungual onychomycosis of the toenail

BACKGROUND

Preliminary clinical data suggest that fluconazole is effective in the treatment of patients with onychomycosis. To design optimum dosage regimens, a better understanding of fluconazole's distribution into and elimination from nails is needed.

OBJECTIVE

The purpose of this study was to determine plasma and toenail concentrations of fluconazole.

METHODS

In this multicenter, randomized, double-blind investigation, fluconazole (150 mg, 300 mg, or 450 mg) or matching placebo was administered once a week for a maximum of 12 months to patients with onychomycosis of the toenail. A total of 151 subjects participated in the pharmacokinetic assessment. Blood samples and distal toenail clippings from both affected and healthy nails were obtained for fluconazole concentration determinations at baseline, at the 2-week visit, at each monthly visit until the end of treatment, and then at 2, 4, and 6 months (nail samples only at the latter two) after fluconazole was discontinued.

RESULTS

Fluconazole was detected in healthy and affected nails at the 2-week assessment in nearly all subjects. The median time to reach steady-state fluconazole concentrations in healthy nails was 4 to 5 months in the three fluconazole dose groups. In affected nails, steady-state fluconazole concentrations were achieved more slowly, with a median time of 6 to 7 months. At the 8-month assessment, affected toenail fluconazole concentrations were higher than corresponding plasma fluconazole concentrations, with ratios of 1.31 to 1.50 in the three active treatment groups. Toenail concentrations of fluconazole declined slowly after treatment was discontinued, with elimination half-lives of 2.5, 2.4, and 3.7 months for the 150, 300, and 450 mg doses, respectively. Measurable fluconazole concentrations were still present in toenails at 6 months after treatment in most subjects.

CONCLUSION

Fluconazole penetrates healthy and diseased nails rapidly, yielding detectable concentrations after two weekly doses. Once it penetrates nail, fluconazole persists for up to 6 months or longer after therapy is stopped. These favorable pharmacokinetic characteristics support a once-weekly fluconazole dosage regimen for the treatment of patients with onychomycosis.

Once-weekly fluconazole (150, 300, or 450 mg) in the treatment of distal subungual onychomycosis of the toenail

BACKGROUND

Onychomycosis is a prevalent infection of the nail caused primarily by dermatophytes. Fluconazole is active in vitro against the most common pathogens of onychomycosis, penetrates into the nail bed, and is clinically effective in the treatment of a wide variety of superficial fungal infections.

OBJECTIVE

The purpose of this study was to compare the efficacy and safety of three different doses of fluconazole (150, 300, and 450 mg) given orally once weekly to that of placebo in the treatment of distal subungual onychomycosis of the toenail caused by dermatophytes.

METHODS

In this multicenter, double-blind study, 362 patients with mycologically confirmed onychomycosis were randomized to treatment with fluconazole, 150, 300, or 450 mg once weekly, or placebo once weekly for a maximum of 12 months. To enter the study, patients were required to have at least 25% involvement of the target nail with at least 2 mm of healthy nail from the nail fold to the proximal onychomycotic border. Patients who were clinically cured or improved at the end of treatment were further evaluated over a 6 month follow-up period. At both the end of therapy and the end of follow-up, clinical success of the target nail was defined as reduction of the affected area to less than 25% or cure.

RESULTS

At the end of therapy, 86% to 89% of patients in the fluconazole treatment groups were judged clinical successes as defined above compared with 8% of placebo-treated patients. Clinical cure (completely healthy nail) was achieved in 28% to 36% of fluconazole-treated patients compared with 3% of placebo-treated patients. Fluconazole demonstrated mycologic eradication rates of 47% to 62% at the end of therapy compared with 14% for placebo. The rates at the end of follow-up were very similar, indicating that eradication of the dermatophyte was maintained over the 6-month period. All efficacy measures for the fluconazole groups were significantly superior to placebo (p=0.0001); there were no significant differences between the fluconazole groups on these efficacy measures. The clinical relapse rate among cured patients over 6 months of follow-up was low at 4%. Fluconazole was well tolerated at all doses over the 12-month treatment period, with the incidence and severity of adverse events being similar between the fluconazole and placebo treatment groups. Mean time to clinical success in the fluconazole treatment groups was 6 to 7 months. This time frame may be used as a guideline for fluconazole treatment duration.

CONCLUSION

The results of this study support the use of fluconazole in the treatment of distal subungual onychomycosis of the toenail caused by dermatophytes. Doses between 150 to 450 mg weekly for 6 months were clinically and mycologically effective as well as safe and well tolerated.

Effect of crosslinking by factor XIIIa on the migration of vascular smooth muscle cells into fibrin gels

We evaluated the migration of vascular smooth muscle cells into crosslinked fibrin gels, using an in vitro assay system. Vascular smooth muscle cells from bovine fetal aorta migrated into non-crosslinked and crosslinked fibrin gels and showed a characteristic elongated spindle-shaped appearance with long cytoplasmic processes. The cells displayed two-fold increase in migration into crosslinked fibrin gels compared to non-crosslinked gels, suggesting the importance of fibrin crosslinking by factor XIIIa on its three-dimensional structure for the migration of smooth muscle cells.

Effect of onychomycosis on quality of life

BACKGROUND

Onychomycosis impairs normal nail functions, causes considerable pain, interferes with daily activities, and has negative psychosocial effects.

OBJECTIVE

Our purpose was to determine patients' perception of onychomycosis on the quality of life.

METHODS

A total of 258 patients with confirmed onychomycosis were surveyed by telephone at three centers. Responses to a standardized quality-of-life questionnaire were analyzed for patient demographics, physical and functional impact, psychosocial impact, and economic impact.

RESULTS

Highest positive responses were nail-trimming problems (76%), embarrassment (74%), pain (48%), nail pressure (40%), and discomfort wearing shoes (38%). Ability to pick up small objects was impaired in 41% of subjects with fingernail involvement. More than 58 onychomycosis-related sick days and 468 medical visits (1.8 per subject) were reported during a 6-month period.

CONCLUSION

Onychomycosis has significant social, psychologic, health, and occupational effects. Relevance of quality-of-life issues to overall health, earning potential, and social functioning should prompt reconsideration of the value of aggressive treatment of and financial coverage for onychomycosis.

In vitro metabolism of ceftiofur in bovine tissues

The metabolism of ceftiofur in bovine kidney, liver, muscle and lung, and the effects of the presence of cystine and glutathione in the media were evaluated using S-9 and microsomal tissue fractions. Conversion of ceftiofur to desfuroylceftiofur (DFC) was catalyzed by an esterase which was most active in kidney, followed by liver. It was not very active in muscle and lung. After DFC was liberated, it rapidly bound primarily to tissue proteins (> 56%), and was also conjugated to cysteine and glutathione. Production of DFC-cysteine by disulfide exchange of DFC with cystine and production of DFC-glutathione by conjugation of DFC to glutathione occurred in buffer if glutathione and cystine were present in the medium. These conjugations were also observed in incubations with tissue fractions, indicating that they were not inhibited by the tissues endogenous molecules. In addition, the metabolism of DFC-glutathione to DFC-cysteine was observed when tissue proteins were present. The metabolism of DFC-glutathione to DFC-cysteine was faster in kidney than in liver. Metabolites devoid of an intact beta-lactam ring were not observed in these in vitro studies.

Bacteriology of inflamed and uninflamed epidermal inclusion cysts

OBJECTIVE

To determine whether inflamed and uninflamed epidermoid cysts differ in the number and/or type of bacteria inhabiting them.

DESIGN

A controlled study. We obtained aerobic and anaerobic bacterial culture specimens from 25 inflamed and 25 uninflamed epidermoid cysts.

SETTING

A university medical center.

PATIENTS

Nonimmunocompromised adults without recent systemic use of antibiotics.

RESULTS

The 2 groups did not differ significantly with respect to number of bacterial isolates, "no growth" cultures, and aerobic, anaerobic, or potential pathogens cultured.

CONCLUSIONS

The microbiological milieu of inflamed epidermoid cysts is similar to that of uninflamed cysts. Possible mechanisms for inflammation are discussed.

Occurrence of Cowpea Stunt Disease Causing Viruses on Wild Bean in Arkansas

Cucumber mosaic cucumovirus (CMV) and blackeye cowpea mosaic potyvirus (BlCMV) interact synergistically in dually infected plants to cause cowpea stunt disease (1,2). During a July 1996 survey of cowpea stunt-affected fields in the Arkansas River valley, several wild bean (Strophostyles helvola L. Elliott) plants expressing mosaic symptoms were observed and collected. Sap was extracted from symptomatic leaves and used as inoculum to conduct a host range study. Virus symptoms diagnostic for BlCMV, CMV, or cowpea stunt were observed 6 to 8 days post-inoculation on Vigna unguiculata (L.) Walp. subsp. unguiculata cv. Coronet, while chlorotic lesions and mild systemic mosaic symptoms developed on Nicotiana benthamiana. Enzyme-linked immunosorbent assays (ELISAs) conducted on extracts from symptomatic cowpea and N. benthamiana 14 days after inoculation verified the presence of CMV and BlCMV in single and mixed infections. Additional symptomatic wild bean plants were collected from the same site in October 1996. ELISAs and Ouchterlony gel diffusion assays confirmed the presence of CMV and BlCMV, as well as soybean mosaic potyvirus (SMV), cowpea chlorotic mottle bromovirus, and alfalfa mosaic virus (AlMV) in symptomatic wild bean plants. While some of the collected plants were infected with only one virus, others had combined infections of CMV and BlCMV or these two viruses with AlMV. Interestingly, AlMV isolated from wild bean caused symptoms on greenhouse-grown cowpeas that were as severe or more severe than those caused by the cowpea stunt synergy, often resulting in plant death within 8 to 10 days after inoculation. The SMV from wild bean did not induce symptoms on cowpea and was not detected in extracts from inoculated cowpea plants by Ouchterlony gel diffusion assays, but was able to systemically infect soybean (Glycine max L.) cvs. Bragg and Lee. Another virus known to infect cowpea, southern bean mosaic sobemovirus, was not detected in any of the samples tested. To our knowledge, this is the first report that wild bean can serve as an alternate host for cowpea stunt-causing viruses in single and mixed infections. In addition, these data suggest that AlMV may pose a threat to Arkansas-grown cowpeas. References: (1) E. J. Anderson et al. Ark. Farm Res. 43:14, 1994. (2) G. Pio-Ribeiro et al. Phytopathology 68:1260, 1978.

Enhancement of hepatitis C virus NS3 proteinase activity by association with NS4A-specific synthetic peptides: identification of sequence and critical residues of NS4A for the cofactor activity

The NS3 proteinase of hepatitis C virus utilizes NS4A as a cofactor for cleavages at four sites (3/4A, 4A/4B, 4B/5A, and 5A/5B) in the nonstructural region of the viral polyprotein. To characterize NS4A for its role in modulating the NS3 proteinase activity at various cleavage sites, synthetic peptides spanning various parts of NS4A were synthesized and tested in a cell-free trans-cleavage reaction using purified NS3 proteinase domain and polyprotein substrates. The NS3 proteinase domain was expressed in Escherichia coli, purified, denatured, and refolded to an enzymatically active form. We found that a 12-amino-acid peptide containing amino acid residues 22 to 33 in NS4A (CVVIVGRIVLSG) was sufficient for cofactor activity in NS3-mediated proteolysis. The peptide enhanced the cleavage at the NS5A/5B site and was necessary for NS3-mediated cleavage at NS4A/4B and NS4B/5A. Sequential amino acid substitution within the designated peptide identified residues I29 and I25 as critical for potential cofactor activity. We provide evidence that the NS4A peptide and the NS3 catalytic domain form an enzymatically active complex. These data suggest that the central 12-amino-acid peptide (aa 22-33) of NS4A is primarily important for the cofactor activity through complex formation with NS3, and the interaction may represent a new target for antiviral drug development.

Haemostatic factors and atherogenesis

It is increasingly realised that fibrin deposition and fibrin lysis are major factors in vascular pathology. In addition to thrombotic occlusion fibrin is a component of atherosclerotic lesions, but the increased interest in components of the haemostatic system was mainly triggered by clinical use of fribrinolytic agents, and the problems of re-stenosis following angioplasty. This review focuses on the main components of the fibrinolytic system--tissue plasminogen activator (tPA), urokinase (uPA) and plasminogen activator inhibitor (PAI-1)--and on thrombin. These factors are not only involved in fluid phase clotting and clot lysis; they react specifically with cells and matrix components. During the last 5 years, the main period under review, there have been numerous studies on their interactions with endothelial and smooth muscle cells in culture, in whole tissues and in vivo, and with arterial extracellular matrix of which a major component is fibrin. Plasminogen activators bind to cell surface receptors, influence cell migration and release active thrombin from fibrin. Thrombin emerges as a pluripotent factor which modulates many aspects of endothelial and smooth muscle cell behaviour, including release and synthesis of fibrinolytic components, and stimulation of cell proliferation.

Prothrombin-related antigens in human aortic intima

Most plasma proteins are present in both normal and atherosclerotic intima, and their concentrations in intimal interstitial fluid are directly related to plasma concentration and molecular size. All intimal samples also contain soluble fibrin-fibrinogen-related antigens, consisting of variable mixtures of fibrinogen and fibrinogen and fibrin degradation products; the extracted washed tissue contains insoluble fibrin. It appears that the fibrinogen is subjected both to degradation and to conversion to fibrin, which in turn undergoes lysis. Biochemically, insoluble "fibrin" can be detected by incubating the washed tissue with plasmin, and assaying the fibrin degradation products that are released; they are released from all samples, including small amounts from normal intima. The fibrin could arise by incorporation of a mural fibrin clot and/or clotting of the fibrinogen within the intima, which contains a "cocktail" of clotting-related factors including prothrombin/thrombin-related antigens, antithrombin III (AT III), and other protease inhibitors: in recent experiments stripped intima was immediately treated with ethylenediaminetetraacetic acid, minced, extracted with Tris-buffered saline, and the extracts analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting with antisera to prothrombin and AT III. Surprisingly, all blots treated with antiprothrombin antisera showed large bands migrating with free thrombin (36 to 37 kDa) and prothrombin (74 kDa) and four intermediate bands. In addition, in all 10 samples examined a band of high molecular mass (170 kDa) but variable intensity was present. This 170-kDa band comigrated with the major band reacting with anti-serum to AT III. The theoretical 1:1 thrombin:AT III complex (98 kDa) was not detected. Thus active thrombin appears to be present in intima, and this may be a highly atherogenic factor, both causing fibrin deposition and acting as a potent mitogen for arterial smooth muscle cells.

Glycine activation of human homomeric alpha 1 glycine receptors is sensitive to pressure in the range of the high pressure nervous syndrome

The effect of hyperbaric pressure on the inhibitory glycine receptor has been investigated in voltage-clamped Xenopus oocytes microinjected with cRNA encoding the human alpha-1 glycine receptor subunit. Heterologous expression of the human alpha-1 subunit generated functional glycine-gated channels with properties typical of native receptors. Glycine elicited a concentration-dependent inward current which reversed polarity at -25 mV and was antagonised by nanomolar concentrations of strychnine. Concentration-response curves established for the homomeric alpha-1 glycine receptor at 5, 10 and 15 MPa were progressively shifted to the right with respect to the concentration response curve established at atmospheric pressure (0.1 MPa). Pressure had no effect on the maximal response. The EC(50) values at 0.1, 5, 10 and 15 MPa were 190 mu M, 222 mu M, 338 mu M and 482 mu M, respectively. The results demonstrate that a receptor comprised solely of the human alpha-subunit is sensitive to pressure in the range that affects divers and at which the native rat spinal cord receptor is affected. This finding is discussed in the context of the postulated binding sites for glycine and the implications for the design of drugs to protect divers from the effects of pressure.

Health-care reform and its impact on African-American surgical specialists

Since 1960, numerous concepts of health-care reform have been submitted to the US Congress and the American public with different viewpoints and objectives. The priority for the US Congress to pass a bipartisan health-reform plan has been circumvented by the newly elected majority Republican Congress. Nevertheless, health-care cost containment, quality control, and health-care delivery concepts have been implemented gradually into the concept of competitive managerial health care. A few of the serious problems in the African-American community are the efficiency and quality of the health-care delivery system and the effects of managed care on African-American primary physicians and surgical specialists. The critical shortages of this group, especially the latter, may create a dilemma in the implementation of a quality surgical care delivery system. The Association of American Medical Colleges, the American College of Surgeons, and other affiliating organizations should become sensitized to the African-American community's health needs, deficiencies, and the rational institution of an equitable, efficient, comprehensive, and quality health-care plan coupled with a sustained and increasing supply of certified, diversified, and experienced African-American surgical manpower in company with family practice physicians and primary care physicians.

The effects of lumbosacral support belts and abdominal muscle strength on functional lifting ability in healthy women

STUDY DESIGN

This study focused on lumbosacral support belts, abdominal muscle strength, and lifting ability in healthy women. Subjects underwent manual muscle testing to determine muscle strength and performed lifting procedures to determine lifting capacity.

OBJECTIVES

The purpose of this study is threefold: 1) to determine the effectiveness of lumbosacral support belts in improving lifting ability in healthy women, 2) to determine if lumbosacral support belts are more effective for those with weak abdominals than those with strong abdominals, and 3) to determine if the maximum amount of weight varies with abdominal muscle strength.

SUMMARY OF BACKGROUND DATA

In a review of published literature, one study has addressed the relationship of lumbosacral support belts and lifting capacity. However, no study has examined the use of lumbosacral support belts and lifting capacity in a female population.

METHODS

A convenient sample of 69 healthy women, aged 20 to 40 years, participated in this study. Subjects were categorized into one of three groups based on lower and upper abdominal muscle strength. Each subject then performed two lifting procedures, one with a lumbosacral support belt and one without, to determine two maximum lifts.

RESULTS

Women between the ages of 20 and 40 years could lift approximately 1.0 kg more weight from the floor to waist height with the lumbosacral support belt. The maximum weight lifted varied with abdominal strength. Lumbosacral support belts were not more effective for those with weak abdominals than those with strong abdominals.

CONCLUSIONS

When applied properly and used in conjunction with proper lifting technique, lumbosacral support belts slightly improved lifting ability in healthy women. The magnitude of the increase, although statistically significant, is not sufficient to advocate the use of lumbosacral support belts to increase lifting capacity.

The nurse's role in diagnosing and treating onychomycosis

Onychomycosis involves fungal invasion of the nail unit via the nail bed or nail plate. Nurses play an important role in diagnosing the disease, managing it, and educating patients about it. Newer oral antifungal agents have increased success rates with shortened treatment times.

Determination of ceftiofur and its desfuroylceftiofur-related metabolites in swine tissues by high-performance liquid chromatography

An HPLC method was developed and validated for the determination of ceftiofur-related metabolites that have the potential to be microbiologically active in swine muscle, kidney, liver and fat. Its performance was evaluated against incurred-residue swine tissues. This method is based on the cleavage of the disulfide and/or thioester bonds between the metabolites and their conjugate sulfur containing moiety using dithioerythritol to yield desfuroylceftiofur, and further stabilization to desfuroylceftiofur acetamide. The limit of quantitation was 0.1 micrograms ceftiofur equivalents/g tissue. The assay is specific for ceftiofur-related metabolites when evaluated against commercially available antibiotics for swine.

Elastoderma

Elastoderma is an exceedingly rare condition that is characterized clinically as an acquired localized laxity of skin resembling cutis laxa and histologically as an excessive accumulation of pleomorphic elastic structures within the dermis. We report the case of a 27-year-old white man with a 2-year history of lax, extensible, wrinkled skin with areas of protrusion and ulceration localized to the anterior aspect and back of the neck. Histologic examination of specimens from the affected area revealed increased masses of intertwined thin, elastic fibers without calcification in the papillary and upper reticular dermis. Transmission and scanning electron microscopy demonstrated irregular deposition of elastic material at the periphery of elastic tissue fibers, with grapelike globular structures. To our knowledge, this is the second reported case of elastoderma.

Fibrinogen, fibrin and the arterial wall

Virtually all plasma proteins, including fibrinogen, low density lipoprotein and lipoprotein(a), are present in normal arterial intima and in atherosclerotic lesions, and their concentrations are related to plasma concentrations. Fibrin is also a significant component of many lesions, particularly early proliferative (gelatinous) lesions, where it may be muscle cells migrate and proliferate, bind thrombin, and are a source of fibrin degradation products (FDPs), which are mitogenic. Very recent studies suggest that free a-thrombin may be present in lesions despite an apparent excess of antithrombin III, so this may promote fibrin formation within the lesion. Furthermore, fibrinolysis and FDP generation may be mediated by catheptic enzymes in addition to plasmin.

Economic issues for African-American surgical specialists in solo or group practices

This clinical research plan was designed to evaluate the predictable and current developments, growth, and stability of the economic status of part-time or full-time African-American practicing surgeons. In many communities throughout the United States, the economic successes of certified or experienced black surgical specialists are inhibited or modified by mistrust, jealousy, professional disengagements, prejudices, and self-hatred by black and white physicians and lay African Americans. Nevertheless, there are subtle and overt evidences of increasing satisfactory and above average associative interprofessional relationships between African-American physicians and surgical specialists. One hundred African-American surgical specialists from thirty-four communities in the United States were interviewed at periodic intervals over a period of three decades. Recommendations for improvements and changes are presented.

Lipids and plasma fibrinogen: early and late composition of the atherosclerotic plaque

Raised levels of plasma low density lipoprotein, lipoprotein (a), and fibrinogen have emerged as major risk factors for myocardial infarction and atherosclerosis. In this brief review some of their interactions with arterial intima are discussed. All the plasma macro-molecules appear to be present even in normal intima, and to cross the endothelium in healthy, young experimental animals by vesicular transport. The precursor of large fibrous plaques appears to be the gelatinous lesion, which is characterized by oedema, accumulation of large amounts of low density lipoproteins and fibrinogen in the expanded interstitial fluid space, deposition of fibrin, and smooth muscle cell proliferation. It is postulated that deposition of fibrin may be a key event, stimulating smooth muscle cell proliferation by providing a scaffold for migration, a source of fibrin degradation products which are mitogenic, and binding thrombin. Fibrin may also be a factor in lipid accumulation because it binds lipoprotein (a) with high affinity, and may also bind low density lipoprotein.

Effect of infrared analyzer homogenization efficiency on repeatability of uncorrected fat A and fat B signals

Poor repeatability by infrared milk analyzers may be caused by inefficient homogenization as a result of light scattering and the Christiansen effect. The objectives of this study were to identify instruments with good and poor homogenization efficiency and to determine if a difference exists in repeatability performance between instruments with good vs poor homogenization efficiency. Unhomogenized and homogenized portions of the same milk were tested 20 times consecutively on 22 instruments. An instrument was considered to have poor homogenization efficiency if the mean difference in the uncorrected signal between unhomogenized and homogenized portions of the same milk was > or = 1.43% of the fat test (i.e., > or = 0.05% at 3.5% fat). Instruments were evaluated for repeatability by calculating the sample standard deviation and the range of the latter 19 uncorrected readings for unhomogenized and homogenized milks. When repeatability was evaluated as a function of homogenization efficiency, there was a significant (p = 0.001) correlation between poor homogenization efficiency and poor repeatability when testing unhomogenized milk but not when testing homogenized milk. Improved homogenizer performance within infrared milk analyzers is needed to improve the repeatability of raw milk testing.

Fibrin deposition and fibrin degradation products in atherosclerotic plaques

Soluble fibrin/fibrinogen-related antigens and insoluble fibrin are present in virtually all samples of human aortic intima. Components of the soluble fraction were identified by SDS-PAGE and immunoblotting with specific antisera. The fibrinogen was characterized by increased proportions of low molecular mass (Mr) species (300 and 280 kD), the FDP by fragments DY and DD derived from crosslinked fibrin, and by fragment E that lacked fibrinopeptide A (FPA). Experiments suggest that fibrin is formed in situ, and free thrombin was present in all 10 samples analysed for prothrombin-related antigen (PtRA). Fibrin-derived fragment E is mitogenic, so fibrin degradation may provide continuing stimulation of smooth muscle cell (SMC) proliferation.

Effect of infrared analyzer homogenization efficiency on linearity of uncorrected fat A and fat B signals

The objective of the survey was to determine if poor homogenizer performance causes nonlinear behavior of the uncorrected fat A or fat B signal that is not detected when an instrument's residual nonlinearity is determined by using dilutions of homogenized milk instead of unhomogenized milk. Unhomogenized and homogenized (17238 kPa) portions of the same 6.1% fat milk were tested on 20 instruments to determine homogenization efficiency. Instruments with differences of > or = 0.087% fat between homogenized and unhomogenized portions of the same milk had inefficient homogenization, on the basis of criteria established in a previous study. Four and 12 instruments out of 20 demonstrated inefficient homogenization for the fat A and fat B channels, respectively. Uncorrected signal linearity for the fat channels was evaluated quantitatively by using a series of dilutions of homogenized (17238 kPa) and unhomogenized milks. Most instruments passed the linearity evaluation for dilutions of either homogenized or unhomogenized milk, even though many of the same instruments failed the homogenization efficiency evaluation. Thus, using dilutions of homogenized milk is valid for linearity evaluation of instruments being used for testing unhomogenized milk in the range of fat concentrations used for payment testing.

Gout masquerading as rheumatoid vasculitis

A 30-year-old Mexican woman had rash, deep ulcerations of her lower extremities, and debilitating polyarthritis. Her disorder simulated rheumatoid vasculitis, but serum rheumatoid factor was absent. The diagnosis of gout was confirmed by uric acid crystals in joint fluid and skin biopsy specimens and by x-ray crystallography. The age and sex were unusual for a patient with gout, and she had none of the commonly associated metabolic defects. This unique presentation for urate arthropathy needs further study.

The effect of high pressure on glycine- and kainate-sensitive receptor channels expressed in Xenopus oocytes

The effect of high pressure on the response to glycine or kainate of voltage-clamped Xenopus oocytes micro-injected with messenger-RNA derived from either rat spinal cord or whole brain, respectively, has been investigated. Current responses were measured at 1 bar (= 10(5) Pa), 50 bar, 100 bar and 150 bar, with PO2 fixed at 1 bar and the balance helium. Glycine elicited a depolarizing current response which was antagonized by nanomolar concentrations of strychnine. The responses reversibly desensitized, with a decay constant of 0.01 s-1, when glycine concentrations greater than 250 microM were used. The decay constant was insensitive to both glycine concentration and pressure. Resensitization was complete within 4 min. Kainate elicited a depolarizing current which was non-desensitizing. The response was slightly sensitive to glutamate diethyl ester (50 microM), which increased the EC50 by 25%. The action of glycine was highly pressure sensitive. The dose-response curves established at 50 bar, 100 bar and 150 bar were shifted progressively to the right, with no effect on the maximal current. The EC50 increased from 216 microM to 296 microM at 50 bar, to 345 microM at 100 bar, and to 425 microM at 150 bar. The action of kainate was unaffected by pressure. No shift in the dose-response curves was established, nor was there any effect on the maximum current. The EC50 was 113 microM at 1 bar, and 111 microM at both 50 bar and 100 bar.(ABSTRACT TRUNCATED AT 250 WORDS)

Presence of growth-stimulating fibrin degradation products containing fragment E in human atherosclerotic plaques

The key event in the formation of stenosing atherosclerotic lesions is widely thought to be smooth muscle cell proliferation, but the factors primarily responsible for initiating this remain uncertain. Previously we have shown that aqueous extracts of proliferative types of human atherosclerotic plaque stimulate cell proliferation in the chick chorioallantoic membrane (CAM). This has been attributed largely to the fibrin degradation products in the extracts, components removeable by affinity chromatography. We now demonstrate that the fibrinogen content of the extract, removeable by clotting out with thrombin, also makes a contribution to the activity by forming fibrin on the surface of the CAM. Affinity chromatography experiments using anti fragment D and E antisera indicate that activity resides in the E-containing fibrin fragments, consistent with previous work with FDP prepared in vitro.

Topical antifungal drugs in the treatment of tinea pedis, tinea cruris, and tinea corporis

Topical treatment of fungal infections took a step forward in the 1960s with the introduction of biologically active agents with specific antifungal mechanisms of action. Most modern broad-spectrum antifungal agents act by blocking specific steps in the synthesis of fungal cell membrane components. The broad-spectrum topical antifungal drugs now in use include the imidazoles (e.g. clotrimazole and miconazole), a pyridone-ethanolamine salt, dimethylmorpholines, and the newest class, the allylamines (e.g., naftifine and terbinafine). The topical allylamines have been shown in comparative studies to produce higher cure rates and more rapid responses in dermatophyte infections than many of the older agents.

Fibrin degradation products in growth stimulatory extracts of pathological lesions

We have previously shown that similar patterns of fibrin degradation products (FbDP) by gel electrophoresis and immunoblotting are present in extracts of human atherosclerotic plaques, human and experimental wounds and breast cancers. Such extracts were also shown to stimulate cell proliferation including angiogenesis in the chick chorioallantoic membrane, now shown also for breast cancers. Removal of FbDP from plaque extracts by an anti-fibrinogen affinity column, or by an anti-fragment E column, reduced activity. Human FbDP prepared in vitro were active, but not FgDP. Fibrin fragment E was active, and we also showed that admixture of FbDP with a polyclonal rabbit anti-fibrin E but not anti-fibrin D neutralized activity. However attempts to raise comparable monoclonal blocking antibodies were hindered by species similarities. The response of the Balb/c mouse was predominantly directed at minor D contaminants, in contrast to the Sprague-Dawley rat which responded to fibrin fragment E in our antigen preparation.